#!/bin/bash
#====================================================================
# Runs EPMacro (macro preprocessor for EnergyPlus input files)
#
# This script needs the environment variable ENERGYPLUS_DIR to be
# set to the root directory of EnergyPlus.
#
# April 28, 2003, Linda@Lawrie.com
# modified March 29, 2009, kyle.benne@nrel.gov
# Added support to find ENERGYPLUS_DIR if unset by user
#====================================================================

HEADER="=============== EPMacro ================="
# Name of executable
PRG_N=EPMacro
# Input path
INP_P=`pwd`
# Output path
OUT_P=$INP_P
# output/input file names
LINK_NAMES="in.imf out.idf audit.out"

# function to set ENERGYPLUS_DIR relative to this script
function SetEnergyPlusDir() {
  unamestr=`uname`
  if [ "$unamestr" == 'Darwin' ]; then
    ENERGYPLUS_DIR="/usr"
  else
    U_DIR=`pwd`
    if [ -n "`readlink "$0"`" ]; then
      S_DIR=$(cd "$(dirname "$(readlink "$0")")"; pwd)
      cd "$U_DIR"
    else
      S_DIR=$(cd "$(dirname "$0")"; pwd)
      cd "$U_DIR"
    fi
    ENERGYPLUS_DIR=`dirname "$S_DIR"`
  fi
}

# Check for user set ENERGYPLUS_DIR
auto_eplus_dir=true
if [ -n "$ENERGYPLUS_DIR" ]; then
  auto_eplus_dir=false
fi

# Set the ENERGYPLUS_DIR
if $auto_eplus_dir; then
  SetEnergyPlusDir
fi

# ==========================================================
function Usage() {
  echo "Usage:  runepmacro InputFileName"
  echo "   or:  runepmacro --clean (or -c)"
  echo "   or:  runepmacro --help (or -h)"
  echo ""
  echo "Runs EPMacro program."
  echo ""
  echo "InputFileName does not have a file extension."
  echo ""
  echo " --clean, or -c    deletes all output files in the current directory"
  echo " --help, or -h     displays this help"
}
# ==========================================================
function CleanOutputFiles() {
  # delete files
  # delete links
  for files in $LINK_NAMES;
  do
    if [ -L $files ]; then
      rm $files
    fi
  done
  echo "Deleted output files";
}
# ==========================================================
function ExitWithError() {
  echo "===== EnergyPlus terminated with error ====="
  exit 1
}
# ==========================================================
if [ "$1" = ""  ]; then
  Usage ; exit 0;
fi

if [ "$1" = "--help" ]; then
  Usage ; exit 0;
fi

if [ "$1" = "-h" ]; then
  Usage ; exit 0;
fi

# ==========================================================
if [ "$ENERGYPLUS_DIR" = "" ]; then
  echo "$HEADER";
  echo "To use EnergyPlus, you need to set the";
  echo "environment variable ENERGYPLUS_DIR to";
  echo "the root directory of EnergyPlus.";
  ExitWithError;
fi

# ==========================================================
# Clean output files only
if [ $1 = --clean ]; then
  CleanOutputFiles ; exit 0;
fi

if [ $1 = -c ]; then
  CleanOutputFiles ; exit 0;
fi

# ==========================================================
# Prepare to run EPMacro
# Check for imf file
if [ ! -f $INP_P/$1.imf ]; then
  echo "$HEADER"
  echo "First argument must the input file name,"
  echo "did not find $INP_P/$1.imf"
  echo ""
  Usage
  ExitWithError
fi

# ==========================================================
echo "$HEADER"
echo "   Input file  : $1.imf"

# ==========================================================
# Delete all output files
for filename in $LINK_NAMES;
do
  rm -f $filename
done

# ==========================================================
# Make links
ln -s $INP_P/$1.imf in.imf

# ==========================================================
# Start energyplus
if $auto_eplus_dir; then
  $ENERGYPLUS_DIR/bin/$PRG_N
else
  $ENERGYPLUS_DIR/$PRG_N
fi

# ==========================================================
# Move output files (except inp, since it is only a symlink)

if [ -f audit.out ]; then
  mv audit.out $1.epmdet
fi

if [ -f out.idf ]; then
  mv out.idf $1.epmidf
fi

# Delete additional files
for filename in $LINK_NAMES;
do
  if [ -f $filename ]; then
    rm $filename
  fi
done

#====================================================================
# Check for error
#
# Not implemented for EPMacro
